Heterodyne measurements of 12C18O, 13C16O, and 13C18 O laser frequencies; mass dependence of Dunham coefficients

Improved Parameterization for Combined Isotopomer Analysis of Diatomic Spectra and Its Application to HF and DF

“…If non-Dunham expressions (such as near-dissociation expansions (12)(13)(14)(15) are used for the vibration-rotation energies of the reference isotopomer ␣ ϭ 1, the vibrational and rotational quantum numbers in the expansions for the reference species (␣ ϭ 1) are simply replaced by the first-order semiclassically scaled quantities: [10] while the treatment of the mass-dependent correction terms and the values of the associated corrections coefficients {␦ l,m A } and…”

Born-Oppenheimer breakdown effects and hyperfine structure in the rotational spectra of SbF and SbCl

“…Effects due to the breakdown of the Born-Oppenheimer approximation were in evidence. The PtO and PtS spectra obtained were analysed using the Dunham-type formalisms of Ross et al [32] and Watson [33]. This approach, generally appropriate for molecules in 1 R + states, enabled Born-Oppenheimer breakdown terms to be obtained for all atoms.…”

Observation of Electronic Isotope Shifts in Molecular Bromine

“…It is easily shown that (1/µ 79,81 − 1/µ 81 ) = (1/µ 79 − 1/µ 79,81 This anomalous isotope dependence in the electronic term values has an important consequence for the models currently used to fit several isotopomers simultaneously (5,7,11). The expression used to fit the Dunham coefficients of several isotopomers is usually written as are isotopically independent parameters.…”

“…The measured second difference d(79, R(1); 79, R(2)) = −0.2 MHz; see Eq. [11]. The same procedure was used to determine the other entries in Table 1.…”